grails 4 unit test controller could not find class

I am using grails 4 to create unit test for controller https://testing.grails.org/latest/guide/index.html

My controller is under grails-app/controllers/mypack/myfolder/exampleController.groovy

My unit test is under src/test/groovy/mypack/myfolder/exampleControllerSpec.groovy

my unit test is like this class DemoControllerSpec extends Specification implements ControllerUnitTest< exampleController>

but it complain can not resolve symbol 'exampleController'

anything wrong here?

how to import exampleController

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